That’s interesting, I have heard about using ADSR to influence the groove but it’s not something I’ve really investigated for a long time. Just been playing with the tool now and it’s blown my mind how much difference it can make to the sound, not so much with the groove (haven’t got that far yet with it) but just overall sound, I tend not to play with the envelopes unless there is an obvious need for it but this tool make it so much quicker and easier to do. Definitely will be adjusting it for every drum sample I ever use now.
Yes it`s far more essential than one might suspect. Those couple of steps to and back from the modulation view can break workflow and have stopped me experimenting so much. I think this tool will be a bit of a reflex action from now on 
It is much more convenient to have it assigned to a key but would it be useful to have it in the tools menu as well? It didn’t seem to appear there for me.
Also, perhaps the ability to change the track from the tool UI would be very useful.
0.41 is now up in first post.
https://forum.renoise.com/t/new-tool-3-0-quick-vol-ahdsr/43997
The menu has been added (plus other bits and pieces), I will think about adding track changing.
In the mean time you may find this other small tool I wrote useful?: the 0.52 version is the keyboard only one which is quicker: